I read a webtoon a while ago that I'm blanking on the title. It starts with a princess being locked away after her kingdom was conquered in a slave revolt. The slaves, these artificial beings that serve humanity, overthrew them and one of them became king. Said king is keeping her hostage despite killing everyone but her and her sister.

Main thing: Dude tells her that she wouldn't have had to suffer if she had only chosen him as her knight years prior but the chick was morally against the slave thing and refused to get one. She is then poisoned by her evil sister and the king, mourning her, chooses to bring her back to life by (kind of) sending her mind back in time the way most reincarnation stories go. It's just that she has no clue he's the one who did so. She decides to redo her life with the goal of becoming the crown princess to undo the slavery policy with the help of the man who would later start the revolution.

I'm no angel, but I'm more pure than you.

The Princess Imprints the Traitor

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